Add tests from the official test suite

[progval]

This imports tests from https://github.com/apache/orc/tree/main/examples and adds tests which read using this crate, output JSON, and compare with the expected results.

As a side-effect, I also amended write.py to write in that format, and run the same kind of test on those.

This works well for the latter (except test and f32_long_long_gzip because of inconsistent JSON serialization between Python and Rust); but I am struggling to make it work on any test of the official test suite.

Here are the errors I'm getting on the five tests I'm running from the official test suite:

thread 'compare_json::metaData' panicked at 'attempt to subtract with overflow', /home/rust/orc-format/src/read/mod.rs:75:30
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

---- compare_json::testTimestamp stdout ----
thread 'compare_json::testTimestamp' panicked at 'Timestamp not implemented', tests/it/compare_json.rs:218:22

---- compare_json::test1 stdout ----
thread 'compare_json::test1' panicked at 'Could not deserialize stripe 0 column 2 (boolean1) as kind Byte: OutOfSpec', tests/it/compare_json.rs:60:42

---- compare_json::orc_file_11_format stdout ----
thread 'compare_json::orc_file_11_format' panicked at 'Failed to unwrap metadata: OutOfSpec', tests/it/compare_json.rs:79:49Timestamp not implemented

---- compare_json::testSeek stdout ----
thread 'compare_json::testSeek' panicked at 'index out of bounds: the len is 255 but the index is 255', /home/rust/orc-format/src/read/decode/boolean_rle.rs:119:34

Timestamp not implemented is expected, but I can't make the others work. Any idea if it's a bug in my test code, or limitations in the rest of the crate?